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Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Basic earnings per common share:                      
Net income available to shareholders $ 1,988 $ 1,884 $ 1,412 $ 1,998 $ 1,994 $ 2,540 $ 1,927 $ 2,138 $ 7,282 $ 8,599 $ 7,654
Basic earnings per share (in dollars per share) $ 0.35 $ 0.33 $ 0.25 $ 0.35 $ 0.35 $ 0.45 $ 0.34 $ 0.38 $ 1.29 $ 1.52 $ 1.35
Diluted earnings per common share:                      
Net income available to shareholders $ 1,988 $ 1,884 $ 1,412 $ 1,998 $ 1,994 $ 2,540 $ 1,927 $ 2,138 $ 7,282 $ 8,599 $ 7,654
Average shares outstanding (in shares)                 5,639,744 5,662,013 5,662,081
Effect of dilutive stock options (in shares)                 0 0 0
Average shares outstanding including dilutive stock options (in shares)                 5,639,744 5,662,013 5,662,081
Diluted earnings per share (in dollars per share) $ 0.35 $ 0.33 $ 0.25 $ 0.35 $ 0.35 $ 0.45 $ 0.34 $ 0.38 $ 1.29 $ 1.52 $ 1.35